High SNR Φ-OTDR with Multi-Transverse Modes Heterodyne Matched-Filtering Technology. - Yifan Liu; Junqi Yang; Bingyan Wu; Bin Lu; Luwei Shuai; Zhaoyong Wang; Lei Ye; Kang Ying; Qing Ye; Ronghui Qu; Haiwen Cai (Sensors, 2021)